Voltage regulator



Aug. 13, 1929. v LOCK 1,724,846

VOLTAGE REGULATOR Filed Jan. 7, 1925 INVENTOR MICHAE LOCK ORNEY"Patented Aug. 13, 1929.

UNITED STATES v 1,724,846 PATENT OFFICE.

MICHAEL LOOK, OF BERLIN, GERMANY, ASSIGNOR TO GESELLSCIIAFT FIIRDRAI-IT- LOSE TELEGRAPHIE M. B. H., OF BERLIN, GERMANY, A CORPORATION OFGER- MANY.

VOLTAGE REGULATOR.

Application filed January 7, 1925, Serial No. 938, and in GermanyJanuary 14, 1924.

ators, is particularly applicable to use on air-' ships where thegenerator for supplying the filament current of thermionic tubes of aradio set is driven by a propeller.

This and other objects will be apparent from the following descriptionand claims when considered with the accompanying drawing in which thesingle figure is a diagrammatic representation of the invention.

The principle of the invention is, that the speed variations of thepropeller effect a. centrifugal governor by which the voltage vari- 2ations which are caused by the speed variations are compensated. Anappropriate embodiment of the invention is obtained by having one ormore springs arranged on a disc which is driven by the propeller, thesesprings being influenced by the centrifugal force at a certain speed, sothat they eflect contact devices which act upon the excitation of thegenerator producing the filament current. The voltage regulation is thencarried out by producing a countermagnetization in the exciting windingsof the filament current generator at increasing speed, causing anincrease of voltage, and by shortcircuiting a resistance in the excitingwindings at decreasing speed.

Referring to the drawing for a more detailed description of thepreferred arrangement, S is the disc driven by and rotating togetherwith the propeller (not shown).

46 On this disc one end of spring F is secured, the other end workingbetween two contact points K and K also fixed to the disc S. G is thefilament current generator also driven by the propeller. At increasingspeed 50 the spring F is brought into contact with K whereby acounter-winding M is inserted into the excitation of the generator andconsequently the voltage is decreased. If the speed decreases, thespring F is not only disconnected from contact point K thereby cuttingout the counter-winding M, but it is brought into contact with contactpoint K and the resistance IV shortcircuited, the voltage through thefield windings f thus increased, and the voltage again increased. If thespeed now increases, the spring F will be disconnected from contact Kcutting in resistance 'W and also will make contact with Contact point KThus this cycle of events will continue so long as the speed ofgenerator G varies and the voltage will be kept substantially constantin spite of these variations.

Having described one embodiment of my invention, I am entitled to allmodifications thereof as fall fairly within the scope of the followingclaims.

I claim:

1. In a regulating system, a generator, a main field winding and anoppositely wound auxiliary field winding. a resistance in series withthe main field winding, a regulator comprising a eentrifugally actuatedbody and contact members associated therewith for cutting in and outboth the resistance and said auxiliary winding upon changes in the speedof rotation of said generator.

2. In a regulating system the combination of a generator. a pair ofelements associated'with the field circuit of the generator to vary thefield strength in like manner when both are rendered operative and amember centrifugally actuated in accordance with the generator speedadapted to render said pair of elements operative.

3. In a regulating system a generator, a controlling winding operativefor varying the field of said generator, a resistance for varying thefield'current, a regulator comprising a body centrifugally actuated inaccordance with the speed of the generator and having contact membersassociated there with for simultaneously cutting said field resistancein and out of the field circuit and rendering said controlling windingrespectively operative and inoperative.

4. A regulating system, comprising a generator having two oppositelyacting exciting field windings, a resistance in series with one of saidwindings, a centrifugal regulator device mounted on and turning with theshaft of said generator, and having contact means for cutting in and outsaid resistance and one of said windings upon changes in the speed ofrotation of said generator shaft;

5. A regulating system, comprising a generator having a field winding, aresistance in said field winding, a second field winding acting inopposition to said first named Winding, and means comprising acentrifugally operated device for eliminating said resistance and saidoppositely acting Winding at certain speeds of said generator andbringing said resistance and said oppositely acting winding intooperation at certain other speeds of said generator for controlling thefield thereof.

6. A regulating system, comprising a generator having two oppositelyacting field windings, a resistance in series with one of said windings,a regulator comprising a centrifugally actuated body, contact membersactuated by opposite movements thereof, means controlled by one of saidcontacts and said centrifugally actuated body for short circuiting saidresistance at 'low speeds of said generator and means controlled by saidother contact and said centrifugally actuated body for effecting acounter-magnetizing action on said generator field at high speeds ofsaid generator.

7. In a regulating system, a generator having two oppositely actingfield windings, a resistance in series with one of said windings, aregulating device mounted on'the shaft of said generator, acentrifugally actuated vibrating arm on said device, two contacts alsoon said device and disposed one on each side of said vibrating arm,whereby said vibrating arm may contact with one of said contacts atcertain speeds of said shaft and with the other of said contacts atcertain other speeds of said shaft, connections between said contacts,said vibrating arm, said resistance and one of said field windings,whereby said resistance and said last named Winding are cut in and outaccording to the speed of said shaft to control the voltage of saidgenerator.-

7 MICHAEL LOOK.

